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【题目】Listen! Someone at the door. Please go and answer it.
A.knocks
B.is knocking
C.has knocked
D.was knocking

【答案】B
【解析】句意:听!有人在敲门。请去看一看。像Listen,look, now等表示现在时间,要用现在进行时态,现在进行时的构成:be+doing;根据Listen!可知现在的时间,要用现在进行时态,结合句意和语境可知选B。

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